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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .da{width:600px;background-color: #dedede; padding: 20px;}
        .db{height: 140px;box-sizing: border-box;padding:15px 0px;width: 600px;background-color: white;}
        .db li{display: inline-block;list-style: none;width:70px;margin-left: 50px;padding-bottom: 15px;text-align: center;}
        .db .dd{margin-left: 0px;border-bottom: 5px solid red;}
       .db .de{ margin-left: 0px;margin-top: 20px;}
    </style>
</head>
<body>
    <div class="da"> 
        <div class="db">
            <ul>
                <li class="dd">标签一</li>
                <li>标签二</li>
                <li>标签三</li>
                <li>标签四</li><br>
                <li class="de">内容一</li>  
            </ul>
        </div>
    </div>
</body>
</html>